AFE Big Boost (6637 Replacement) Filters!!

JAP · Jul 11, 2012

Powerstroke Cowboy said:
Thanks!!! I will see what I can find... :thumbup:

Let me know what you find out!

GreenMachine said:
i have a k&n setup on my 2000. i havent had a chance to measure the intake tube, but think its the same? i'd like to ditch the k&n cone and run this bad boy.

I would think so. As long as your mounting flange is 4".

Powerstroke Cowboy · Jul 12, 2012

JAP said:
Let me know what you find out!

I will do that!!!!

Powerstroke Cowboy · Jul 13, 2012

JAP said:
Let me know what you find out!

I emailed them and here is what he sent back......

David,

Yes, I do have the flow number for that part# and they are 468 CFM at 1.5” of water.

Please call should you have any questions.

Thank you,

Steven Baker

Direct Sales

That is good flow number for only 1.5" of water.... If it was rated @8" like the 6637.. it would flow 800cfm + !!!!

I will try to figure it out...

I might have to go with this filter IF it is cleanable!!!

Powerstroke Cowboy · Jul 13, 2012

OK got it figuard out...

the 6637 flow 425 CFM @8" of water..

The AFE 21-90058 flows 468 CFM @ 1.5" of water..

Now when you conver the 21-90058 to 8" of water to see how it compares to the 6637.. Its like WOW!!!!

Here it is the AFE 21-90058 flows 1076 CFM @ 8" of water....... NOW that is a BIG inprovment!!!!